sum.hpp

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#ifndef __STAN__MATH__MATRIX__SUM_HPP__
#define __STAN__MATH__MATRIX__SUM_HPP__

#include <vector>
#include <stan/math/matrix/Eigen.hpp>

namespace stan {
  namespace math {
   
    template <typename T>
    inline T sum(const std::vector<T>& xs) {
      if (xs.size() == 0) return 0;
      T sum(xs[0]);
      for (size_t i = 1; i < xs.size(); ++i)
        sum += xs[i];
      return sum;
    }
 
    template <typename T, int R, int C>
    inline double sum(const Eigen::Matrix<T,R,C>& v) {
      return v.sum();
    }    
    
  }
}
#endif